1 // SPDX-License-Identifier: GPL-2.0
3 #ifndef _LINUX_KERNEL_TRACE_H
4 #define _LINUX_KERNEL_TRACE_H
7 #include <linux/atomic.h>
8 #include <linux/sched.h>
9 #include <linux/clocksource.h>
10 #include <linux/ring_buffer.h>
11 #include <linux/mmiotrace.h>
12 #include <linux/tracepoint.h>
13 #include <linux/ftrace.h>
14 #include <linux/hw_breakpoint.h>
15 #include <linux/trace_seq.h>
16 #include <linux/trace_events.h>
17 #include <linux/compiler.h>
18 #include <linux/glob.h>
20 #ifdef CONFIG_FTRACE_SYSCALLS
21 #include <asm/unistd.h> /* For NR_SYSCALLS */
22 #include <asm/syscall.h> /* some archs define it here */
26 __TRACE_FIRST_TYPE = 0,
50 #define __field(type, item) type item;
53 #define __field_struct(type, item) __field(type, item)
56 #define __field_desc(type, container, item)
59 #define __array(type, item, size) type item[size];
62 #define __array_desc(type, container, item, size)
64 #undef __dynamic_array
65 #define __dynamic_array(type, item) type item[];
68 #define F_STRUCT(args...) args
71 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
72 struct struct_name { \
73 struct trace_entry ent; \
77 #undef FTRACE_ENTRY_DUP
78 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
80 #undef FTRACE_ENTRY_REG
81 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
83 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
86 #undef FTRACE_ENTRY_PACKED
87 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \
89 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
92 #include "trace_entries.h"
95 * syscalls are special, and need special handling, this is why
96 * they are not included in trace_entries.h
98 struct syscall_trace_enter {
99 struct trace_entry ent;
101 unsigned long args[];
104 struct syscall_trace_exit {
105 struct trace_entry ent;
110 struct kprobe_trace_entry_head {
111 struct trace_entry ent;
115 struct kretprobe_trace_entry_head {
116 struct trace_entry ent;
118 unsigned long ret_ip;
122 * trace_flag_type is an enumeration that holds different
123 * states when a trace occurs. These are:
124 * IRQS_OFF - interrupts were disabled
125 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
126 * NEED_RESCHED - reschedule is requested
127 * HARDIRQ - inside an interrupt handler
128 * SOFTIRQ - inside a softirq handler
130 enum trace_flag_type {
131 TRACE_FLAG_IRQS_OFF = 0x01,
132 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
133 TRACE_FLAG_NEED_RESCHED = 0x04,
134 TRACE_FLAG_HARDIRQ = 0x08,
135 TRACE_FLAG_SOFTIRQ = 0x10,
136 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
137 TRACE_FLAG_NMI = 0x40,
140 #define TRACE_BUF_SIZE 1024
145 * The CPU trace array - it consists of thousands of trace entries
146 * plus some other descriptor data: (for example which task started
149 struct trace_array_cpu {
151 void *buffer_page; /* ring buffer spare */
153 unsigned long entries;
154 unsigned long saved_latency;
155 unsigned long critical_start;
156 unsigned long critical_end;
157 unsigned long critical_sequence;
159 unsigned long policy;
160 unsigned long rt_priority;
161 unsigned long skipped_entries;
162 u64 preempt_timestamp;
165 char comm[TASK_COMM_LEN];
168 #ifdef CONFIG_FUNCTION_TRACER
169 bool ftrace_ignore_pid;
174 struct trace_option_dentry;
176 struct trace_buffer {
177 struct trace_array *tr;
178 struct ring_buffer *buffer;
179 struct trace_array_cpu __percpu *data;
184 #define TRACE_FLAGS_MAX_SIZE 32
186 struct trace_options {
187 struct tracer *tracer;
188 struct trace_option_dentry *topts;
191 struct trace_pid_list {
196 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
199 * struct cond_snapshot - conditional snapshot data and callback
201 * The cond_snapshot structure encapsulates a callback function and
202 * data associated with the snapshot for a given tracing instance.
204 * When a snapshot is taken conditionally, by invoking
205 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
206 * passed in turn to the cond_snapshot.update() function. That data
207 * can be compared by the update() implementation with the cond_data
208 * contained wihin the struct cond_snapshot instance associated with
209 * the trace_array. Because the tr->max_lock is held throughout the
210 * update() call, the update() function can directly retrieve the
211 * cond_snapshot and cond_data associated with the per-instance
212 * snapshot associated with the trace_array.
214 * The cond_snapshot.update() implementation can save data to be
215 * associated with the snapshot if it decides to, and returns 'true'
216 * in that case, or it returns 'false' if the conditional snapshot
217 * shouldn't be taken.
219 * The cond_snapshot instance is created and associated with the
220 * user-defined cond_data by tracing_cond_snapshot_enable().
221 * Likewise, the cond_snapshot instance is destroyed and is no longer
222 * associated with the trace instance by
223 * tracing_cond_snapshot_disable().
225 * The method below is required.
227 * @update: When a conditional snapshot is invoked, the update()
228 * callback function is invoked with the tr->max_lock held. The
229 * update() implementation signals whether or not to actually
230 * take the snapshot, by returning 'true' if so, 'false' if no
231 * snapshot should be taken. Because the max_lock is held for
232 * the duration of update(), the implementation is safe to
233 * directly retrieven and save any implementation data it needs
234 * to in association with the snapshot.
236 struct cond_snapshot {
238 cond_update_fn_t update;
242 * The trace array - an array of per-CPU trace arrays. This is the
243 * highest level data structure that individual tracers deal with.
244 * They have on/off state as well:
247 struct list_head list;
249 struct trace_buffer trace_buffer;
250 #ifdef CONFIG_TRACER_MAX_TRACE
252 * The max_buffer is used to snapshot the trace when a maximum
253 * latency is reached, or when the user initiates a snapshot.
254 * Some tracers will use this to store a maximum trace while
255 * it continues examining live traces.
257 * The buffers for the max_buffer are set up the same as the trace_buffer
258 * When a snapshot is taken, the buffer of the max_buffer is swapped
259 * with the buffer of the trace_buffer and the buffers are reset for
260 * the trace_buffer so the tracing can continue.
262 struct trace_buffer max_buffer;
263 bool allocated_snapshot;
265 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
266 unsigned long max_latency;
268 struct trace_pid_list __rcu *filtered_pids;
270 * max_lock is used to protect the swapping of buffers
271 * when taking a max snapshot. The buffers themselves are
272 * protected by per_cpu spinlocks. But the action of the swap
273 * needs its own lock.
275 * This is defined as a arch_spinlock_t in order to help
276 * with performance when lockdep debugging is enabled.
278 * It is also used in other places outside the update_max_tr
279 * so it needs to be defined outside of the
280 * CONFIG_TRACER_MAX_TRACE.
282 arch_spinlock_t max_lock;
284 #ifdef CONFIG_FTRACE_SYSCALLS
285 int sys_refcount_enter;
286 int sys_refcount_exit;
287 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
288 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
295 unsigned int n_err_log_entries;
296 struct tracer *current_trace;
297 unsigned int trace_flags;
298 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
300 raw_spinlock_t start_lock;
301 struct list_head err_log;
303 struct dentry *options;
304 struct dentry *percpu_dir;
305 struct dentry *event_dir;
306 struct trace_options *topts;
307 struct list_head systems;
308 struct list_head events;
309 struct trace_event_file *trace_marker_file;
310 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
313 #ifdef CONFIG_FUNCTION_TRACER
314 struct ftrace_ops *ops;
315 struct trace_pid_list __rcu *function_pids;
316 #ifdef CONFIG_DYNAMIC_FTRACE
317 /* All of these are protected by the ftrace_lock */
318 struct list_head func_probes;
319 struct list_head mod_trace;
320 struct list_head mod_notrace;
322 /* function tracing enabled */
323 int function_enabled;
325 int time_stamp_abs_ref;
326 struct list_head hist_vars;
327 #ifdef CONFIG_TRACER_SNAPSHOT
328 struct cond_snapshot *cond_snapshot;
333 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
336 extern struct list_head ftrace_trace_arrays;
338 extern struct mutex trace_types_lock;
340 extern int trace_array_get(struct trace_array *tr);
341 extern void trace_array_put(struct trace_array *tr);
342 extern int tracing_check_open_get_tr(struct trace_array *tr);
344 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
345 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
347 extern bool trace_clock_in_ns(struct trace_array *tr);
350 * The global tracer (top) should be the first trace array added,
351 * but we check the flag anyway.
353 static inline struct trace_array *top_trace_array(void)
355 struct trace_array *tr;
357 if (list_empty(&ftrace_trace_arrays))
360 tr = list_entry(ftrace_trace_arrays.prev,
362 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
366 #define FTRACE_CMP_TYPE(var, type) \
367 __builtin_types_compatible_p(typeof(var), type *)
370 #define IF_ASSIGN(var, entry, etype, id) \
371 if (FTRACE_CMP_TYPE(var, etype)) { \
372 var = (typeof(var))(entry); \
373 WARN_ON(id != 0 && (entry)->type != id); \
377 /* Will cause compile errors if type is not found. */
378 extern void __ftrace_bad_type(void);
381 * The trace_assign_type is a verifier that the entry type is
382 * the same as the type being assigned. To add new types simply
383 * add a line with the following format:
385 * IF_ASSIGN(var, ent, type, id);
387 * Where "type" is the trace type that includes the trace_entry
388 * as the "ent" item. And "id" is the trace identifier that is
389 * used in the trace_type enum.
391 * If the type can have more than one id, then use zero.
393 #define trace_assign_type(var, ent) \
395 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
396 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
397 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
398 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
399 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
400 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
401 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
402 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
403 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
404 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
406 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
408 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
409 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
411 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
413 __ftrace_bad_type(); \
417 * An option specific to a tracer. This is a boolean value.
418 * The bit is the bit index that sets its value on the
419 * flags value in struct tracer_flags.
422 const char *name; /* Will appear on the trace_options file */
423 u32 bit; /* Mask assigned in val field in tracer_flags */
427 * The set of specific options for a tracer. Your tracer
428 * have to set the initial value of the flags val.
430 struct tracer_flags {
432 struct tracer_opt *opts;
433 struct tracer *trace;
436 /* Makes more easy to define a tracer opt */
437 #define TRACER_OPT(s, b) .name = #s, .bit = b
440 struct trace_option_dentry {
441 struct tracer_opt *opt;
442 struct tracer_flags *flags;
443 struct trace_array *tr;
444 struct dentry *entry;
448 * struct tracer - a specific tracer and its callbacks to interact with tracefs
449 * @name: the name chosen to select it on the available_tracers file
450 * @init: called when one switches to this tracer (echo name > current_tracer)
451 * @reset: called when one switches to another tracer
452 * @start: called when tracing is unpaused (echo 1 > tracing_on)
453 * @stop: called when tracing is paused (echo 0 > tracing_on)
454 * @update_thresh: called when tracing_thresh is updated
455 * @open: called when the trace file is opened
456 * @pipe_open: called when the trace_pipe file is opened
457 * @close: called when the trace file is released
458 * @pipe_close: called when the trace_pipe file is released
459 * @read: override the default read callback on trace_pipe
460 * @splice_read: override the default splice_read callback on trace_pipe
461 * @selftest: selftest to run on boot (see trace_selftest.c)
462 * @print_headers: override the first lines that describe your columns
463 * @print_line: callback that prints a trace
464 * @set_flag: signals one of your private flags changed (trace_options file)
465 * @flags: your private flags
469 int (*init)(struct trace_array *tr);
470 void (*reset)(struct trace_array *tr);
471 void (*start)(struct trace_array *tr);
472 void (*stop)(struct trace_array *tr);
473 int (*update_thresh)(struct trace_array *tr);
474 void (*open)(struct trace_iterator *iter);
475 void (*pipe_open)(struct trace_iterator *iter);
476 void (*close)(struct trace_iterator *iter);
477 void (*pipe_close)(struct trace_iterator *iter);
478 ssize_t (*read)(struct trace_iterator *iter,
479 struct file *filp, char __user *ubuf,
480 size_t cnt, loff_t *ppos);
481 ssize_t (*splice_read)(struct trace_iterator *iter,
484 struct pipe_inode_info *pipe,
487 #ifdef CONFIG_FTRACE_STARTUP_TEST
488 int (*selftest)(struct tracer *trace,
489 struct trace_array *tr);
491 void (*print_header)(struct seq_file *m);
492 enum print_line_t (*print_line)(struct trace_iterator *iter);
493 /* If you handled the flag setting, return 0 */
494 int (*set_flag)(struct trace_array *tr,
495 u32 old_flags, u32 bit, int set);
496 /* Return 0 if OK with change, else return non-zero */
497 int (*flag_changed)(struct trace_array *tr,
500 struct tracer_flags *flags;
503 bool allow_instances;
504 #ifdef CONFIG_TRACER_MAX_TRACE
507 /* True if tracer cannot be enabled in kernel param */
512 /* Only current can touch trace_recursion */
515 * For function tracing recursion:
516 * The order of these bits are important.
518 * When function tracing occurs, the following steps are made:
519 * If arch does not support a ftrace feature:
520 * call internal function (uses INTERNAL bits) which calls...
521 * The function callback, which can use the FTRACE bits to
522 * check for recursion.
526 TRACE_BUFFER_NMI_BIT,
527 TRACE_BUFFER_IRQ_BIT,
528 TRACE_BUFFER_SIRQ_BIT,
530 /* Start of function recursion bits */
532 TRACE_FTRACE_NMI_BIT,
533 TRACE_FTRACE_IRQ_BIT,
534 TRACE_FTRACE_SIRQ_BIT,
535 TRACE_FTRACE_TRANSITION_BIT,
537 /* Internal use recursion bits */
539 TRACE_INTERNAL_NMI_BIT,
540 TRACE_INTERNAL_IRQ_BIT,
541 TRACE_INTERNAL_SIRQ_BIT,
542 TRACE_INTERNAL_TRANSITION_BIT,
546 * Abuse of the trace_recursion.
547 * As we need a way to maintain state if we are tracing the function
548 * graph in irq because we want to trace a particular function that
549 * was called in irq context but we have irq tracing off. Since this
550 * can only be modified by current, we can reuse trace_recursion.
554 /* Set if the function is in the set_graph_function file */
558 * In the very unlikely case that an interrupt came in
559 * at a start of graph tracing, and we want to trace
560 * the function in that interrupt, the depth can be greater
561 * than zero, because of the preempted start of a previous
562 * trace. In an even more unlikely case, depth could be 2
563 * if a softirq interrupted the start of graph tracing,
564 * followed by an interrupt preempting a start of graph
565 * tracing in the softirq, and depth can even be 3
566 * if an NMI came in at the start of an interrupt function
567 * that preempted a softirq start of a function that
568 * preempted normal context!!!! Luckily, it can't be
569 * greater than 3, so the next two bits are a mask
570 * of what the depth is when we set TRACE_GRAPH_BIT
573 TRACE_GRAPH_DEPTH_START_BIT,
574 TRACE_GRAPH_DEPTH_END_BIT,
577 * To implement set_graph_notrace, if this bit is set, we ignore
578 * function graph tracing of called functions, until the return
579 * function is called to clear it.
581 TRACE_GRAPH_NOTRACE_BIT,
584 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
585 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
586 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
588 #define trace_recursion_depth() \
589 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3)
590 #define trace_recursion_set_depth(depth) \
592 current->trace_recursion &= \
593 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \
594 current->trace_recursion |= \
595 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \
598 #define TRACE_CONTEXT_BITS 4
600 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
602 #define TRACE_LIST_START TRACE_INTERNAL_BIT
604 #define TRACE_CONTEXT_MASK ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
611 TRACE_CTX_TRANSITION,
614 static __always_inline int trace_get_context_bit(void)
618 if (in_interrupt()) {
625 bit = TRACE_CTX_SOFTIRQ;
627 bit = TRACE_CTX_NORMAL;
632 static __always_inline int trace_test_and_set_recursion(int start)
634 unsigned int val = current->trace_recursion;
637 bit = trace_get_context_bit() + start;
638 if (unlikely(val & (1 << bit))) {
640 * It could be that preempt_count has not been updated during
641 * a switch between contexts. Allow for a single recursion.
643 bit = start + TRACE_CTX_TRANSITION;
644 if (trace_recursion_test(bit))
646 trace_recursion_set(bit);
652 current->trace_recursion = val;
658 static __always_inline void trace_clear_recursion(int bit)
660 unsigned int val = current->trace_recursion;
666 current->trace_recursion = val;
669 static inline struct ring_buffer_iter *
670 trace_buffer_iter(struct trace_iterator *iter, int cpu)
672 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
675 int tracer_init(struct tracer *t, struct trace_array *tr);
676 int tracing_is_enabled(void);
677 void tracing_reset_online_cpus(struct trace_buffer *buf);
678 void tracing_reset_current(int cpu);
679 void tracing_reset_all_online_cpus(void);
680 void tracing_reset_all_online_cpus_unlocked(void);
681 int tracing_open_generic(struct inode *inode, struct file *filp);
682 int tracing_open_generic_tr(struct inode *inode, struct file *filp);
683 bool tracing_is_disabled(void);
684 bool tracer_tracing_is_on(struct trace_array *tr);
685 void tracer_tracing_on(struct trace_array *tr);
686 void tracer_tracing_off(struct trace_array *tr);
687 struct dentry *trace_create_file(const char *name,
689 struct dentry *parent,
691 const struct file_operations *fops);
693 struct dentry *tracing_init_dentry(void);
695 struct ring_buffer_event;
697 struct ring_buffer_event *
698 trace_buffer_lock_reserve(struct ring_buffer *buffer,
704 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
705 struct trace_array_cpu *data);
707 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
708 int *ent_cpu, u64 *ent_ts);
710 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
711 struct ring_buffer_event *event);
713 int trace_empty(struct trace_iterator *iter);
715 void *trace_find_next_entry_inc(struct trace_iterator *iter);
717 void trace_init_global_iter(struct trace_iterator *iter);
719 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
721 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
722 unsigned long trace_total_entries(struct trace_array *tr);
724 void trace_function(struct trace_array *tr,
726 unsigned long parent_ip,
727 unsigned long flags, int pc);
728 void trace_graph_function(struct trace_array *tr,
730 unsigned long parent_ip,
731 unsigned long flags, int pc);
732 void trace_latency_header(struct seq_file *m);
733 void trace_default_header(struct seq_file *m);
734 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
735 int trace_empty(struct trace_iterator *iter);
737 void trace_graph_return(struct ftrace_graph_ret *trace);
738 int trace_graph_entry(struct ftrace_graph_ent *trace);
739 void set_graph_array(struct trace_array *tr);
741 void tracing_start_cmdline_record(void);
742 void tracing_stop_cmdline_record(void);
743 void tracing_start_tgid_record(void);
744 void tracing_stop_tgid_record(void);
746 int register_tracer(struct tracer *type);
747 int is_tracing_stopped(void);
749 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
751 extern cpumask_var_t __read_mostly tracing_buffer_mask;
753 #define for_each_tracing_cpu(cpu) \
754 for_each_cpu(cpu, tracing_buffer_mask)
756 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
758 extern unsigned long tracing_thresh;
764 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
766 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
767 struct task_struct *task);
768 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
769 struct task_struct *self,
770 struct task_struct *task);
771 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
772 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
773 int trace_pid_show(struct seq_file *m, void *v);
774 void trace_free_pid_list(struct trace_pid_list *pid_list);
775 int trace_pid_write(struct trace_pid_list *filtered_pids,
776 struct trace_pid_list **new_pid_list,
777 const char __user *ubuf, size_t cnt);
779 #ifdef CONFIG_TRACER_MAX_TRACE
780 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
782 void update_max_tr_single(struct trace_array *tr,
783 struct task_struct *tsk, int cpu);
784 #endif /* CONFIG_TRACER_MAX_TRACE */
786 #ifdef CONFIG_STACKTRACE
787 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
790 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
794 #endif /* CONFIG_STACKTRACE */
796 extern u64 ftrace_now(int cpu);
798 extern void trace_find_cmdline(int pid, char comm[]);
799 extern int trace_find_tgid(int pid);
800 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
802 #ifdef CONFIG_DYNAMIC_FTRACE
803 extern unsigned long ftrace_update_tot_cnt;
804 extern unsigned long ftrace_number_of_pages;
805 extern unsigned long ftrace_number_of_groups;
806 void ftrace_init_trace_array(struct trace_array *tr);
808 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
810 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
811 extern int DYN_FTRACE_TEST_NAME(void);
812 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
813 extern int DYN_FTRACE_TEST_NAME2(void);
815 extern bool ring_buffer_expanded;
816 extern bool tracing_selftest_disabled;
818 #ifdef CONFIG_FTRACE_STARTUP_TEST
819 extern int trace_selftest_startup_function(struct tracer *trace,
820 struct trace_array *tr);
821 extern int trace_selftest_startup_function_graph(struct tracer *trace,
822 struct trace_array *tr);
823 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
824 struct trace_array *tr);
825 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
826 struct trace_array *tr);
827 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
828 struct trace_array *tr);
829 extern int trace_selftest_startup_wakeup(struct tracer *trace,
830 struct trace_array *tr);
831 extern int trace_selftest_startup_nop(struct tracer *trace,
832 struct trace_array *tr);
833 extern int trace_selftest_startup_branch(struct tracer *trace,
834 struct trace_array *tr);
836 * Tracer data references selftest functions that only occur
837 * on boot up. These can be __init functions. Thus, when selftests
838 * are enabled, then the tracers need to reference __init functions.
840 #define __tracer_data __refdata
842 /* Tracers are seldom changed. Optimize when selftests are disabled. */
843 #define __tracer_data __read_mostly
844 #endif /* CONFIG_FTRACE_STARTUP_TEST */
846 extern void *head_page(struct trace_array_cpu *data);
847 extern unsigned long long ns2usecs(u64 nsec);
849 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
851 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
853 trace_array_vprintk(struct trace_array *tr,
854 unsigned long ip, const char *fmt, va_list args);
855 int trace_array_printk(struct trace_array *tr,
856 unsigned long ip, const char *fmt, ...);
857 int trace_array_printk_buf(struct ring_buffer *buffer,
858 unsigned long ip, const char *fmt, ...);
859 void trace_printk_seq(struct trace_seq *s);
860 enum print_line_t print_trace_line(struct trace_iterator *iter);
862 extern char trace_find_mark(unsigned long long duration);
866 struct ftrace_mod_load {
867 struct list_head list;
874 FTRACE_HASH_FL_MOD = (1 << 0),
878 unsigned long size_bits;
879 struct hlist_head *buckets;
885 struct ftrace_func_entry *
886 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
888 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
890 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
893 /* Standard output formatting function used for function return traces */
894 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
897 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
898 #define TRACE_GRAPH_PRINT_CPU 0x2
899 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
900 #define TRACE_GRAPH_PRINT_PROC 0x8
901 #define TRACE_GRAPH_PRINT_DURATION 0x10
902 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
903 #define TRACE_GRAPH_PRINT_REL_TIME 0x40
904 #define TRACE_GRAPH_PRINT_IRQS 0x80
905 #define TRACE_GRAPH_PRINT_TAIL 0x100
906 #define TRACE_GRAPH_SLEEP_TIME 0x200
907 #define TRACE_GRAPH_GRAPH_TIME 0x400
908 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
909 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
911 extern void ftrace_graph_sleep_time_control(bool enable);
913 #ifdef CONFIG_FUNCTION_PROFILER
914 extern void ftrace_graph_graph_time_control(bool enable);
916 static inline void ftrace_graph_graph_time_control(bool enable) { }
919 extern enum print_line_t
920 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
921 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
923 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
924 extern void graph_trace_open(struct trace_iterator *iter);
925 extern void graph_trace_close(struct trace_iterator *iter);
926 extern int __trace_graph_entry(struct trace_array *tr,
927 struct ftrace_graph_ent *trace,
928 unsigned long flags, int pc);
929 extern void __trace_graph_return(struct trace_array *tr,
930 struct ftrace_graph_ret *trace,
931 unsigned long flags, int pc);
933 #ifdef CONFIG_DYNAMIC_FTRACE
934 extern struct ftrace_hash __rcu *ftrace_graph_hash;
935 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
937 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
939 unsigned long addr = trace->func;
941 struct ftrace_hash *hash;
943 preempt_disable_notrace();
946 * Have to open code "rcu_dereference_sched()" because the
947 * function graph tracer can be called when RCU is not
949 * Protected with schedule_on_each_cpu(ftrace_sync)
951 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
953 if (ftrace_hash_empty(hash)) {
958 if (ftrace_lookup_ip(hash, addr)) {
961 * This needs to be cleared on the return functions
962 * when the depth is zero.
964 trace_recursion_set(TRACE_GRAPH_BIT);
965 trace_recursion_set_depth(trace->depth);
968 * If no irqs are to be traced, but a set_graph_function
969 * is set, and called by an interrupt handler, we still
973 trace_recursion_set(TRACE_IRQ_BIT);
975 trace_recursion_clear(TRACE_IRQ_BIT);
980 preempt_enable_notrace();
984 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
986 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
987 trace->depth == trace_recursion_depth())
988 trace_recursion_clear(TRACE_GRAPH_BIT);
991 static inline int ftrace_graph_notrace_addr(unsigned long addr)
994 struct ftrace_hash *notrace_hash;
996 preempt_disable_notrace();
999 * Have to open code "rcu_dereference_sched()" because the
1000 * function graph tracer can be called when RCU is not
1002 * Protected with schedule_on_each_cpu(ftrace_sync)
1004 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
1007 if (ftrace_lookup_ip(notrace_hash, addr))
1010 preempt_enable_notrace();
1014 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
1019 static inline int ftrace_graph_notrace_addr(unsigned long addr)
1023 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
1025 #endif /* CONFIG_DYNAMIC_FTRACE */
1027 extern unsigned int fgraph_max_depth;
1029 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
1031 /* trace it when it is-nested-in or is a function enabled. */
1032 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
1033 ftrace_graph_addr(trace)) ||
1034 (trace->depth < 0) ||
1035 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
1038 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
1039 static inline enum print_line_t
1040 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1042 return TRACE_TYPE_UNHANDLED;
1044 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
1046 extern struct list_head ftrace_pids;
1048 #ifdef CONFIG_FUNCTION_TRACER
1049 struct ftrace_func_command {
1050 struct list_head list;
1052 int (*func)(struct trace_array *tr,
1053 struct ftrace_hash *hash,
1054 char *func, char *cmd,
1055 char *params, int enable);
1057 extern bool ftrace_filter_param __initdata;
1058 static inline int ftrace_trace_task(struct trace_array *tr)
1060 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid);
1062 extern int ftrace_is_dead(void);
1063 int ftrace_create_function_files(struct trace_array *tr,
1064 struct dentry *parent);
1065 void ftrace_destroy_function_files(struct trace_array *tr);
1066 void ftrace_init_global_array_ops(struct trace_array *tr);
1067 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1068 void ftrace_reset_array_ops(struct trace_array *tr);
1069 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1070 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1071 struct dentry *d_tracer);
1072 void ftrace_clear_pids(struct trace_array *tr);
1073 int init_function_trace(void);
1074 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1076 static inline int ftrace_trace_task(struct trace_array *tr)
1080 static inline int ftrace_is_dead(void) { return 0; }
1082 ftrace_create_function_files(struct trace_array *tr,
1083 struct dentry *parent)
1087 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1088 static inline __init void
1089 ftrace_init_global_array_ops(struct trace_array *tr) { }
1090 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1091 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1092 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1093 static inline void ftrace_clear_pids(struct trace_array *tr) { }
1094 static inline int init_function_trace(void) { return 0; }
1095 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1096 /* ftace_func_t type is not defined, use macro instead of static inline */
1097 #define ftrace_init_array_ops(tr, func) do { } while (0)
1098 #endif /* CONFIG_FUNCTION_TRACER */
1100 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1102 struct ftrace_probe_ops {
1103 void (*func)(unsigned long ip,
1104 unsigned long parent_ip,
1105 struct trace_array *tr,
1106 struct ftrace_probe_ops *ops,
1108 int (*init)(struct ftrace_probe_ops *ops,
1109 struct trace_array *tr,
1110 unsigned long ip, void *init_data,
1112 void (*free)(struct ftrace_probe_ops *ops,
1113 struct trace_array *tr,
1114 unsigned long ip, void *data);
1115 int (*print)(struct seq_file *m,
1117 struct ftrace_probe_ops *ops,
1121 struct ftrace_func_mapper;
1122 typedef int (*ftrace_mapper_func)(void *data);
1124 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1125 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1127 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1128 unsigned long ip, void *data);
1129 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1131 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1132 ftrace_mapper_func free_func);
1135 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1136 struct ftrace_probe_ops *ops, void *data);
1138 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1139 struct ftrace_probe_ops *ops);
1140 extern void clear_ftrace_function_probes(struct trace_array *tr);
1142 int register_ftrace_command(struct ftrace_func_command *cmd);
1143 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1145 void ftrace_create_filter_files(struct ftrace_ops *ops,
1146 struct dentry *parent);
1147 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1149 struct ftrace_func_command;
1151 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1155 static inline __init int unregister_ftrace_command(char *cmd_name)
1159 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1164 * The ops parameter passed in is usually undefined.
1165 * This must be a macro.
1167 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1168 #define ftrace_destroy_filter_files(ops) do { } while (0)
1169 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1171 bool ftrace_event_is_function(struct trace_event_call *call);
1174 * struct trace_parser - servers for reading the user input separated by spaces
1175 * @cont: set if the input is not complete - no final space char was found
1176 * @buffer: holds the parsed user input
1177 * @idx: user input length
1178 * @size: buffer size
1180 struct trace_parser {
1187 static inline bool trace_parser_loaded(struct trace_parser *parser)
1189 return (parser->idx != 0);
1192 static inline bool trace_parser_cont(struct trace_parser *parser)
1194 return parser->cont;
1197 static inline void trace_parser_clear(struct trace_parser *parser)
1199 parser->cont = false;
1203 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1204 extern void trace_parser_put(struct trace_parser *parser);
1205 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1206 size_t cnt, loff_t *ppos);
1209 * Only create function graph options if function graph is configured.
1211 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1212 # define FGRAPH_FLAGS \
1213 C(DISPLAY_GRAPH, "display-graph"),
1215 # define FGRAPH_FLAGS
1218 #ifdef CONFIG_BRANCH_TRACER
1219 # define BRANCH_FLAGS \
1220 C(BRANCH, "branch"),
1222 # define BRANCH_FLAGS
1225 #ifdef CONFIG_FUNCTION_TRACER
1226 # define FUNCTION_FLAGS \
1227 C(FUNCTION, "function-trace"), \
1228 C(FUNC_FORK, "function-fork"),
1229 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1231 # define FUNCTION_FLAGS
1232 # define FUNCTION_DEFAULT_FLAGS 0UL
1233 # define TRACE_ITER_FUNC_FORK 0UL
1236 #ifdef CONFIG_STACKTRACE
1237 # define STACK_FLAGS \
1238 C(STACKTRACE, "stacktrace"),
1240 # define STACK_FLAGS
1244 * trace_iterator_flags is an enumeration that defines bit
1245 * positions into trace_flags that controls the output.
1247 * NOTE: These bits must match the trace_options array in
1248 * trace.c (this macro guarantees it).
1250 #define TRACE_FLAGS \
1251 C(PRINT_PARENT, "print-parent"), \
1252 C(SYM_OFFSET, "sym-offset"), \
1253 C(SYM_ADDR, "sym-addr"), \
1254 C(VERBOSE, "verbose"), \
1258 C(BLOCK, "block"), \
1259 C(PRINTK, "trace_printk"), \
1260 C(ANNOTATE, "annotate"), \
1261 C(USERSTACKTRACE, "userstacktrace"), \
1262 C(SYM_USEROBJ, "sym-userobj"), \
1263 C(PRINTK_MSGONLY, "printk-msg-only"), \
1264 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1265 C(LATENCY_FMT, "latency-format"), \
1266 C(RECORD_CMD, "record-cmd"), \
1267 C(RECORD_TGID, "record-tgid"), \
1268 C(OVERWRITE, "overwrite"), \
1269 C(STOP_ON_FREE, "disable_on_free"), \
1270 C(IRQ_INFO, "irq-info"), \
1271 C(MARKERS, "markers"), \
1272 C(EVENT_FORK, "event-fork"), \
1279 * By defining C, we can make TRACE_FLAGS a list of bit names
1280 * that will define the bits for the flag masks.
1283 #define C(a, b) TRACE_ITER_##a##_BIT
1285 enum trace_iterator_bits {
1287 /* Make sure we don't go more than we have bits for */
1292 * By redefining C, we can make TRACE_FLAGS a list of masks that
1293 * use the bits as defined above.
1296 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1298 enum trace_iterator_flags { TRACE_FLAGS };
1301 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1302 * control the output of kernel symbols.
1304 #define TRACE_ITER_SYM_MASK \
1305 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1307 extern struct tracer nop_trace;
1309 #ifdef CONFIG_BRANCH_TRACER
1310 extern int enable_branch_tracing(struct trace_array *tr);
1311 extern void disable_branch_tracing(void);
1312 static inline int trace_branch_enable(struct trace_array *tr)
1314 if (tr->trace_flags & TRACE_ITER_BRANCH)
1315 return enable_branch_tracing(tr);
1318 static inline void trace_branch_disable(void)
1320 /* due to races, always disable */
1321 disable_branch_tracing();
1324 static inline int trace_branch_enable(struct trace_array *tr)
1328 static inline void trace_branch_disable(void)
1331 #endif /* CONFIG_BRANCH_TRACER */
1333 /* set ring buffers to default size if not already done so */
1334 int tracing_update_buffers(void);
1336 struct ftrace_event_field {
1337 struct list_head link;
1348 struct event_filter {
1349 struct prog_entry __rcu *prog;
1350 char *filter_string;
1353 struct event_subsystem {
1354 struct list_head list;
1356 struct event_filter *filter;
1360 struct trace_subsystem_dir {
1361 struct list_head list;
1362 struct event_subsystem *subsystem;
1363 struct trace_array *tr;
1364 struct dentry *entry;
1369 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1370 struct ring_buffer *buffer,
1371 struct ring_buffer_event *event);
1373 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1374 struct ring_buffer *buffer,
1375 struct ring_buffer_event *event,
1376 unsigned long flags, int pc,
1377 struct pt_regs *regs);
1379 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1380 struct ring_buffer *buffer,
1381 struct ring_buffer_event *event,
1382 unsigned long flags, int pc)
1384 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1387 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1388 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1389 void trace_buffered_event_disable(void);
1390 void trace_buffered_event_enable(void);
1393 __trace_event_discard_commit(struct ring_buffer *buffer,
1394 struct ring_buffer_event *event)
1396 if (this_cpu_read(trace_buffered_event) == event) {
1397 /* Simply release the temp buffer */
1398 this_cpu_dec(trace_buffered_event_cnt);
1401 ring_buffer_discard_commit(buffer, event);
1405 * Helper function for event_trigger_unlock_commit{_regs}().
1406 * If there are event triggers attached to this event that requires
1407 * filtering against its fields, then they wil be called as the
1408 * entry already holds the field information of the current event.
1410 * It also checks if the event should be discarded or not.
1411 * It is to be discarded if the event is soft disabled and the
1412 * event was only recorded to process triggers, or if the event
1413 * filter is active and this event did not match the filters.
1415 * Returns true if the event is discarded, false otherwise.
1418 __event_trigger_test_discard(struct trace_event_file *file,
1419 struct ring_buffer *buffer,
1420 struct ring_buffer_event *event,
1422 enum event_trigger_type *tt)
1424 unsigned long eflags = file->flags;
1426 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1427 *tt = event_triggers_call(file, entry, event);
1429 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED |
1430 EVENT_FILE_FL_FILTERED |
1431 EVENT_FILE_FL_PID_FILTER))))
1434 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED)
1437 if (file->flags & EVENT_FILE_FL_FILTERED &&
1438 !filter_match_preds(file->filter, entry))
1441 if ((file->flags & EVENT_FILE_FL_PID_FILTER) &&
1442 trace_event_ignore_this_pid(file))
1447 __trace_event_discard_commit(buffer, event);
1452 * event_trigger_unlock_commit - handle triggers and finish event commit
1453 * @file: The file pointer assoctiated to the event
1454 * @buffer: The ring buffer that the event is being written to
1455 * @event: The event meta data in the ring buffer
1456 * @entry: The event itself
1457 * @irq_flags: The state of the interrupts at the start of the event
1458 * @pc: The state of the preempt count at the start of the event.
1460 * This is a helper function to handle triggers that require data
1461 * from the event itself. It also tests the event against filters and
1462 * if the event is soft disabled and should be discarded.
1465 event_trigger_unlock_commit(struct trace_event_file *file,
1466 struct ring_buffer *buffer,
1467 struct ring_buffer_event *event,
1468 void *entry, unsigned long irq_flags, int pc)
1470 enum event_trigger_type tt = ETT_NONE;
1472 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1473 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1476 event_triggers_post_call(file, tt);
1480 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1481 * @file: The file pointer assoctiated to the event
1482 * @buffer: The ring buffer that the event is being written to
1483 * @event: The event meta data in the ring buffer
1484 * @entry: The event itself
1485 * @irq_flags: The state of the interrupts at the start of the event
1486 * @pc: The state of the preempt count at the start of the event.
1488 * This is a helper function to handle triggers that require data
1489 * from the event itself. It also tests the event against filters and
1490 * if the event is soft disabled and should be discarded.
1492 * Same as event_trigger_unlock_commit() but calls
1493 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1496 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1497 struct ring_buffer *buffer,
1498 struct ring_buffer_event *event,
1499 void *entry, unsigned long irq_flags, int pc,
1500 struct pt_regs *regs)
1502 enum event_trigger_type tt = ETT_NONE;
1504 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1505 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1506 irq_flags, pc, regs);
1509 event_triggers_post_call(file, tt);
1512 #define FILTER_PRED_INVALID ((unsigned short)-1)
1513 #define FILTER_PRED_IS_RIGHT (1 << 15)
1514 #define FILTER_PRED_FOLD (1 << 15)
1517 * The max preds is the size of unsigned short with
1518 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1519 * and FOLD flags. The other is reserved.
1521 * 2^14 preds is way more than enough.
1523 #define MAX_FILTER_PRED 16384
1528 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1530 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1542 char pattern[MAX_FILTER_STR_VAL];
1545 regex_match_func match;
1548 struct filter_pred {
1549 filter_pred_fn_t fn;
1552 unsigned short *ops;
1553 struct ftrace_event_field *field;
1559 static inline bool is_string_field(struct ftrace_event_field *field)
1561 return field->filter_type == FILTER_DYN_STRING ||
1562 field->filter_type == FILTER_STATIC_STRING ||
1563 field->filter_type == FILTER_PTR_STRING ||
1564 field->filter_type == FILTER_COMM;
1567 static inline bool is_function_field(struct ftrace_event_field *field)
1569 return field->filter_type == FILTER_TRACE_FN;
1572 extern enum regex_type
1573 filter_parse_regex(char *buff, int len, char **search, int *not);
1574 extern void print_event_filter(struct trace_event_file *file,
1575 struct trace_seq *s);
1576 extern int apply_event_filter(struct trace_event_file *file,
1577 char *filter_string);
1578 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1579 char *filter_string);
1580 extern void print_subsystem_event_filter(struct event_subsystem *system,
1581 struct trace_seq *s);
1582 extern int filter_assign_type(const char *type);
1583 extern int create_event_filter(struct trace_array *tr,
1584 struct trace_event_call *call,
1585 char *filter_str, bool set_str,
1586 struct event_filter **filterp);
1587 extern void free_event_filter(struct event_filter *filter);
1589 struct ftrace_event_field *
1590 trace_find_event_field(struct trace_event_call *call, char *name);
1592 extern void trace_event_enable_cmd_record(bool enable);
1593 extern void trace_event_enable_tgid_record(bool enable);
1595 extern int event_trace_init(void);
1596 extern int init_events(void);
1597 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1598 extern int event_trace_del_tracer(struct trace_array *tr);
1600 extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1603 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1607 static inline void *event_file_data(struct file *filp)
1609 return READ_ONCE(file_inode(filp)->i_private);
1612 extern struct mutex event_mutex;
1613 extern struct list_head ftrace_events;
1615 extern const struct file_operations event_trigger_fops;
1616 extern const struct file_operations event_hist_fops;
1618 #ifdef CONFIG_HIST_TRIGGERS
1619 extern int register_trigger_hist_cmd(void);
1620 extern int register_trigger_hist_enable_disable_cmds(void);
1622 static inline int register_trigger_hist_cmd(void) { return 0; }
1623 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1626 extern int register_trigger_cmds(void);
1627 extern void clear_event_triggers(struct trace_array *tr);
1629 struct event_trigger_data {
1630 unsigned long count;
1632 struct event_trigger_ops *ops;
1633 struct event_command *cmd_ops;
1634 struct event_filter __rcu *filter;
1639 struct list_head list;
1641 struct list_head named_list;
1642 struct event_trigger_data *named_data;
1646 #define ENABLE_EVENT_STR "enable_event"
1647 #define DISABLE_EVENT_STR "disable_event"
1648 #define ENABLE_HIST_STR "enable_hist"
1649 #define DISABLE_HIST_STR "disable_hist"
1651 struct enable_trigger_data {
1652 struct trace_event_file *file;
1657 extern int event_enable_trigger_print(struct seq_file *m,
1658 struct event_trigger_ops *ops,
1659 struct event_trigger_data *data);
1660 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1661 struct event_trigger_data *data);
1662 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1663 struct trace_event_file *file,
1664 char *glob, char *cmd, char *param);
1665 extern int event_enable_register_trigger(char *glob,
1666 struct event_trigger_ops *ops,
1667 struct event_trigger_data *data,
1668 struct trace_event_file *file);
1669 extern void event_enable_unregister_trigger(char *glob,
1670 struct event_trigger_ops *ops,
1671 struct event_trigger_data *test,
1672 struct trace_event_file *file);
1673 extern void trigger_data_free(struct event_trigger_data *data);
1674 extern int event_trigger_init(struct event_trigger_ops *ops,
1675 struct event_trigger_data *data);
1676 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1677 int trigger_enable);
1678 extern void update_cond_flag(struct trace_event_file *file);
1679 extern int set_trigger_filter(char *filter_str,
1680 struct event_trigger_data *trigger_data,
1681 struct trace_event_file *file);
1682 extern struct event_trigger_data *find_named_trigger(const char *name);
1683 extern bool is_named_trigger(struct event_trigger_data *test);
1684 extern int save_named_trigger(const char *name,
1685 struct event_trigger_data *data);
1686 extern void del_named_trigger(struct event_trigger_data *data);
1687 extern void pause_named_trigger(struct event_trigger_data *data);
1688 extern void unpause_named_trigger(struct event_trigger_data *data);
1689 extern void set_named_trigger_data(struct event_trigger_data *data,
1690 struct event_trigger_data *named_data);
1691 extern struct event_trigger_data *
1692 get_named_trigger_data(struct event_trigger_data *data);
1693 extern int register_event_command(struct event_command *cmd);
1694 extern int unregister_event_command(struct event_command *cmd);
1695 extern int register_trigger_hist_enable_disable_cmds(void);
1698 * struct event_trigger_ops - callbacks for trace event triggers
1700 * The methods in this structure provide per-event trigger hooks for
1701 * various trigger operations.
1703 * All the methods below, except for @init() and @free(), must be
1706 * @func: The trigger 'probe' function called when the triggering
1707 * event occurs. The data passed into this callback is the data
1708 * that was supplied to the event_command @reg() function that
1709 * registered the trigger (see struct event_command) along with
1710 * the trace record, rec.
1712 * @init: An optional initialization function called for the trigger
1713 * when the trigger is registered (via the event_command reg()
1714 * function). This can be used to perform per-trigger
1715 * initialization such as incrementing a per-trigger reference
1716 * count, for instance. This is usually implemented by the
1717 * generic utility function @event_trigger_init() (see
1718 * trace_event_triggers.c).
1720 * @free: An optional de-initialization function called for the
1721 * trigger when the trigger is unregistered (via the
1722 * event_command @reg() function). This can be used to perform
1723 * per-trigger de-initialization such as decrementing a
1724 * per-trigger reference count and freeing corresponding trigger
1725 * data, for instance. This is usually implemented by the
1726 * generic utility function @event_trigger_free() (see
1727 * trace_event_triggers.c).
1729 * @print: The callback function invoked to have the trigger print
1730 * itself. This is usually implemented by a wrapper function
1731 * that calls the generic utility function @event_trigger_print()
1732 * (see trace_event_triggers.c).
1734 struct event_trigger_ops {
1735 void (*func)(struct event_trigger_data *data,
1737 struct ring_buffer_event *rbe);
1738 int (*init)(struct event_trigger_ops *ops,
1739 struct event_trigger_data *data);
1740 void (*free)(struct event_trigger_ops *ops,
1741 struct event_trigger_data *data);
1742 int (*print)(struct seq_file *m,
1743 struct event_trigger_ops *ops,
1744 struct event_trigger_data *data);
1748 * struct event_command - callbacks and data members for event commands
1750 * Event commands are invoked by users by writing the command name
1751 * into the 'trigger' file associated with a trace event. The
1752 * parameters associated with a specific invocation of an event
1753 * command are used to create an event trigger instance, which is
1754 * added to the list of trigger instances associated with that trace
1755 * event. When the event is hit, the set of triggers associated with
1756 * that event is invoked.
1758 * The data members in this structure provide per-event command data
1759 * for various event commands.
1761 * All the data members below, except for @post_trigger, must be set
1762 * for each event command.
1764 * @name: The unique name that identifies the event command. This is
1765 * the name used when setting triggers via trigger files.
1767 * @trigger_type: A unique id that identifies the event command
1768 * 'type'. This value has two purposes, the first to ensure that
1769 * only one trigger of the same type can be set at a given time
1770 * for a particular event e.g. it doesn't make sense to have both
1771 * a traceon and traceoff trigger attached to a single event at
1772 * the same time, so traceon and traceoff have the same type
1773 * though they have different names. The @trigger_type value is
1774 * also used as a bit value for deferring the actual trigger
1775 * action until after the current event is finished. Some
1776 * commands need to do this if they themselves log to the trace
1777 * buffer (see the @post_trigger() member below). @trigger_type
1778 * values are defined by adding new values to the trigger_type
1779 * enum in include/linux/trace_events.h.
1781 * @flags: See the enum event_command_flags below.
1783 * All the methods below, except for @set_filter() and @unreg_all(),
1784 * must be implemented.
1786 * @func: The callback function responsible for parsing and
1787 * registering the trigger written to the 'trigger' file by the
1788 * user. It allocates the trigger instance and registers it with
1789 * the appropriate trace event. It makes use of the other
1790 * event_command callback functions to orchestrate this, and is
1791 * usually implemented by the generic utility function
1792 * @event_trigger_callback() (see trace_event_triggers.c).
1794 * @reg: Adds the trigger to the list of triggers associated with the
1795 * event, and enables the event trigger itself, after
1796 * initializing it (via the event_trigger_ops @init() function).
1797 * This is also where commands can use the @trigger_type value to
1798 * make the decision as to whether or not multiple instances of
1799 * the trigger should be allowed. This is usually implemented by
1800 * the generic utility function @register_trigger() (see
1801 * trace_event_triggers.c).
1803 * @unreg: Removes the trigger from the list of triggers associated
1804 * with the event, and disables the event trigger itself, after
1805 * initializing it (via the event_trigger_ops @free() function).
1806 * This is usually implemented by the generic utility function
1807 * @unregister_trigger() (see trace_event_triggers.c).
1809 * @unreg_all: An optional function called to remove all the triggers
1810 * from the list of triggers associated with the event. Called
1811 * when a trigger file is opened in truncate mode.
1813 * @set_filter: An optional function called to parse and set a filter
1814 * for the trigger. If no @set_filter() method is set for the
1815 * event command, filters set by the user for the command will be
1816 * ignored. This is usually implemented by the generic utility
1817 * function @set_trigger_filter() (see trace_event_triggers.c).
1819 * @get_trigger_ops: The callback function invoked to retrieve the
1820 * event_trigger_ops implementation associated with the command.
1822 struct event_command {
1823 struct list_head list;
1825 enum event_trigger_type trigger_type;
1827 int (*func)(struct event_command *cmd_ops,
1828 struct trace_event_file *file,
1829 char *glob, char *cmd, char *params);
1830 int (*reg)(char *glob,
1831 struct event_trigger_ops *ops,
1832 struct event_trigger_data *data,
1833 struct trace_event_file *file);
1834 void (*unreg)(char *glob,
1835 struct event_trigger_ops *ops,
1836 struct event_trigger_data *data,
1837 struct trace_event_file *file);
1838 void (*unreg_all)(struct trace_event_file *file);
1839 int (*set_filter)(char *filter_str,
1840 struct event_trigger_data *data,
1841 struct trace_event_file *file);
1842 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1846 * enum event_command_flags - flags for struct event_command
1848 * @POST_TRIGGER: A flag that says whether or not this command needs
1849 * to have its action delayed until after the current event has
1850 * been closed. Some triggers need to avoid being invoked while
1851 * an event is currently in the process of being logged, since
1852 * the trigger may itself log data into the trace buffer. Thus
1853 * we make sure the current event is committed before invoking
1854 * those triggers. To do that, the trigger invocation is split
1855 * in two - the first part checks the filter using the current
1856 * trace record; if a command has the @post_trigger flag set, it
1857 * sets a bit for itself in the return value, otherwise it
1858 * directly invokes the trigger. Once all commands have been
1859 * either invoked or set their return flag, the current record is
1860 * either committed or discarded. At that point, if any commands
1861 * have deferred their triggers, those commands are finally
1862 * invoked following the close of the current event. In other
1863 * words, if the event_trigger_ops @func() probe implementation
1864 * itself logs to the trace buffer, this flag should be set,
1865 * otherwise it can be left unspecified.
1867 * @NEEDS_REC: A flag that says whether or not this command needs
1868 * access to the trace record in order to perform its function,
1869 * regardless of whether or not it has a filter associated with
1870 * it (filters make a trigger require access to the trace record
1871 * but are not always present).
1873 enum event_command_flags {
1874 EVENT_CMD_FL_POST_TRIGGER = 1,
1875 EVENT_CMD_FL_NEEDS_REC = 2,
1878 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1880 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1883 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1885 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1888 extern int trace_event_enable_disable(struct trace_event_file *file,
1889 int enable, int soft_disable);
1890 extern int tracing_alloc_snapshot(void);
1891 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1892 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1894 extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1895 extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1897 extern const char *__start___trace_bprintk_fmt[];
1898 extern const char *__stop___trace_bprintk_fmt[];
1900 extern const char *__start___tracepoint_str[];
1901 extern const char *__stop___tracepoint_str[];
1903 void trace_printk_control(bool enabled);
1904 void trace_printk_init_buffers(void);
1905 void trace_printk_start_comm(void);
1906 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1907 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1909 #define MAX_EVENT_NAME_LEN 64
1911 extern int trace_run_command(const char *buf, int (*createfn)(int, char**));
1912 extern ssize_t trace_parse_run_command(struct file *file,
1913 const char __user *buffer, size_t count, loff_t *ppos,
1914 int (*createfn)(int, char**));
1916 extern unsigned int err_pos(char *cmd, const char *str);
1917 extern void tracing_log_err(struct trace_array *tr,
1918 const char *loc, const char *cmd,
1919 const char **errs, u8 type, u8 pos);
1922 * Normal trace_printk() and friends allocates special buffers
1923 * to do the manipulation, as well as saves the print formats
1924 * into sections to display. But the trace infrastructure wants
1925 * to use these without the added overhead at the price of being
1926 * a bit slower (used mainly for warnings, where we don't care
1927 * about performance). The internal_trace_puts() is for such
1930 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1933 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1934 extern struct trace_event_call \
1935 __aligned(4) event_##call;
1936 #undef FTRACE_ENTRY_DUP
1937 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1938 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1940 #undef FTRACE_ENTRY_PACKED
1941 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \
1942 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1945 #include "trace_entries.h"
1947 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1948 int perf_ftrace_event_register(struct trace_event_call *call,
1949 enum trace_reg type, void *data);
1951 #define perf_ftrace_event_register NULL
1954 #ifdef CONFIG_FTRACE_SYSCALLS
1955 void init_ftrace_syscalls(void);
1956 const char *get_syscall_name(int syscall);
1958 static inline void init_ftrace_syscalls(void) { }
1959 static inline const char *get_syscall_name(int syscall)
1965 #ifdef CONFIG_EVENT_TRACING
1966 void trace_event_init(void);
1967 void trace_event_eval_update(struct trace_eval_map **map, int len);
1969 static inline void __init trace_event_init(void) { }
1970 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1973 #ifdef CONFIG_TRACER_SNAPSHOT
1974 void tracing_snapshot_instance(struct trace_array *tr);
1975 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1977 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1978 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1984 #ifdef CONFIG_PREEMPT_TRACER
1985 void tracer_preempt_on(unsigned long a0, unsigned long a1);
1986 void tracer_preempt_off(unsigned long a0, unsigned long a1);
1988 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1989 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1991 #ifdef CONFIG_IRQSOFF_TRACER
1992 void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1993 void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1995 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1996 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1999 extern struct trace_iterator *tracepoint_print_iter;
2002 * Reset the state of the trace_iterator so that it can read consumed data.
2003 * Normally, the trace_iterator is used for reading the data when it is not
2004 * consumed, and must retain state.
2006 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
2008 const size_t offset = offsetof(struct trace_iterator, seq);
2011 * Keep gcc from complaining about overwriting more than just one
2012 * member in the structure.
2014 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
2019 #endif /* _LINUX_KERNEL_TRACE_H */